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How Do Scientists Know That Humans Are Responsible for Global Warming?
Scientists use old fashioned detective work to figure out humans are responsible for Climate Change.Oct 24, 2022 - NBC Miami
"....Scientists can Calculate how much heat different suspects Trap, using a complex understanding of chemistry and physics and feeding that into computer simulations that have been generally accurate in portraying climate, past and future. They Measure what they call Radiative forcing in Watts per Meter Squared.
The first and most frequent natural suspect is the sun. The sun is what warms Earth in general providing about 1,361 watts per meter squared of heat, year in year out. That’s the baseline, the delicate balance that makes Earth livable. Changes in energy coming from the sun have been minimal, about One-Tenth of a Watt per Meter Squared, scientists calculate.
But Carbon Dioxide from the burning of fossil fuels is now Trapping heat to the level of 2.07 Watts per Meter Squared, more than 20 Times that of the changes in the sun, according to the U.S. Environmental Protection Agency. Methane, another powerful heat-trapping gas, is at 0.5 Watts per Meter Square.
The sun’s 11-year cycle goes through regular but small ups and downs, but that doesn’t seem to change Earth’s temperature. And if anything the ever so slight changes in 11-year-average solar irradiance have been shifting downward, according to NASA calculations, with the space agency concluding “it is therefore extremely unlikely that the Sun has caused the observed global temperature warming trend over the past century.”
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